Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block level.
Table A5-9. Negotiation requests (uplink)
Message intent/use  Message element  URG  ALRT  RESP 
148  Request for the earliest time at which the specified level can be accepted.  WHEN CAN YOU ACCEPT (level)  N  L  Y 
149  Instruction to report whether or not the specified level can be accepted at the specified position.  CAN YOU ACCEPT (level) AT (position)  N  L  A/N 
150  Instruction to report whether or not the specified level can be accepted at the specified time.  CAN YOU ACCEPT (level) AT (time)  N  L  A/N 
151  Instruction to report the earliest time when the specified speed can be accepted.  WHEN CAN YOU ACCEPT (speed)  N  L  Y 
152  Instruction to report the earliest time when the specified offset track can be accepted.  WHEN CAN YOU ACCEPT (specified distance) (direction) OFFSET  N  L  Y 

Note.— Wherever the variable “level” is specified, the message can specify either a single level or a vertical range, i.e. block level.
Table A5-10. Air traffic advisories (uplink)
Message intent/use  Message element  URG  ALRT  RESP 
153  ATS advisory that the altimeter setting should be the specified setting.  ALTIMETER (altimeter)  N  L  R 
213  ATS advisory that the specified altimeter setting relates to the specified facility.  (facility designation) ALTIMETER (altimeter)  N  L  R 

Message intent/use  Message element  URG  ALRT  RESP 
154  ATS advisory that the radar service is terminated.  RADAR SERVICE TERMINATED  N  L  R 
191  ATS advisory that the aircraft is entering airspace in which no air traffic services are provided and all existing air traffic services are terminated.  ALL ATS TERMINATED  N  M  R 
155  ATS advisory that radar contact has been established at the specified position.  RADAR CONTACT (position)  N  M  R 
156  ATS advisory that radar contact has been lost.  RADAR CONTACT LOST  N  M  R 
210  ATS advisory that the aircraft has been identified on radar at the specified position.  IDENTIFIED (position)  N  M  R 
193  Notification that radar identification has been lost.  IDENTIFICATION LOST  N  M  R 
157  Notification that a continuous transmission is detected on the specified frequency. Check the microphone button.  CHECK STUCK MICROPHONE (frequency)  U  M  N 
158  ATS advisory that the ATIS information identified by the specified code is the current ATIS information.  ATIS (atis code)  N  L  R 
212  ATS advisory that the specified ATIS information at the specified airport is current.  (facility designation) ATIS (atis code) CURRENT  N  L  R 
214  ATS advisory that indicates the RVR value for the specified runway.  RVR RUNWAY (runway) (rvr)  N  M  R 
224  ATS advisory that no delay is expected.  NO DELAY EXPECTED  N  L  R 
225  ATS advisory that the expected delay has not been determined.  DELAY NOT DETERMINED  N  L  R 
226  ATS advisory that the aircraft may expect to be cleared to commence its approach procedure at the specified time.  EXPECTED APPROACH TIME (time)  N  L  R 

No. 2

Table A5-11. System management messages (uplink)
Message intent/use  Message element  URG  ALRT  RESP 
　
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